She asked if the scientists had done any experiments.

她问科学家们是否做过实验。

He had done this work formerly.

他以前做过这种工作。

He remind me that I had done it before

他提醒我从前未做过这件事

And now he regretted what he had done so much.

现在他后悔做过的蠢事。

Everyone kept asking what Pete had done with Zoe!

大家都在问到底皮特对佐伊做过些什么！

We had done 50 games before Angry Birds.

我们在愤怒的小鸟之前就已经做过50个游戏了。

At that time, that style was something that no one else had done.

那时候那种风格还没有人做过。

It was not long before I regretted what I had done.

不久我就为自己做过的事感到后悔了。

He wrote about things he had done, things he had seen, and thoughts he had had.

他把今天做过的事，看到的事，想到的事都记在里面。

No one had done that since the day he discovered his illness.

自从他患病以来，没有人这样做过！